Phase Structure and Morphology of Wollastonite-Reinforced Polypropylene Composites Modified With SEBS and SEBS-g-MA Elastomers

摘要

Supermolecular structure of isotactic polypropylene/ wollastonite/styrenic rubber block copolymers composites were studied as a function of elastomeric poly-(styrene-b-ethylene-co-butylene-b-styrene) triblock copolymer (SEBS) and the SEBS grafted with maleic anhydride (SEBS-g-MA) content (from 0 to 20 vol%) by optical,scanning,and transmission electron microscopy,wide-angle X-ray diffraction and differential scanning calorimetry.Wollastonite particles disturbed the spherulitization of polypropylene matrix.Both elastomers affected the crystallization of polypropylene matrix mainly by solidification effect.Although SEBS-g-MA encapsulated wollastonite particles more expressive than SEBS forming thus core-shell morphology in higher extent,scanning electron micrographs indicated more constrained wollastonite particles in fractured surfaces of composites with SEBS elastomer.Moreover,SEBS-g-MA disorientated wollastonite particles and affected reorientation of the polypropylene crystallites stronger than SEBS elastomer.